the gap is very small, microns in size (0.001) so not much air and the air that's there gets hot which heats the spinning fins apparently it's more efficient than a standard cooler using the FFHS style including those that use heat pipes

they also say it's very quiet even at high RPM's

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they should make a hydrodynamic bearing out of it, and fill the gap with water.... would be much more efficient in my opinion, as said.
what riddles me is, how they stabilize the vibrating and wobbling, so that the fan base and fin base never touch each other